Uta Barth | Los Angeles Times
By Christopher Knight
In the 1960s, artist Robert Irwin famously forbade publication of photographs of his paintings — the spare abstractions of colored lines against colored fields, the tiny dots covering slightly bowed canvases to create a cloud of hazy gray atmosphere and the plastic or aluminum discs that stand out from the wall but visually appear as orbs that hover in space, like mysterious floating eyeballs.